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A200

A200 - Incompatible Ignition Control/Display Error

Rheem · Water Heaters

What does A200 mean?

This error occurs when the software versions between the Display Control and the Ignition Control are not compatible with each other.

Common Causes

  • Software mismatch between control modules

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Contact technical support for guidance on resolving software incompatibility.

  2. 2

    Ensure the correct software versions are installed for both the display and ignition control.

Browse all codes in this manual (70)
Verified technical data. Last updated: April 2026

Related Faults

1111 - Gas shut-off valve is not fully open1212 - Gas service interrupted or LP gas low13Hot and cold water lines reversed
Source: Rheem Water Heaters
Open Manual (Page 47)Search more codes in this manual